my Toyota RAV4 XA40 (2013-2018) shows P0171 code, how do I fix it?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to identify any hidden leaks.
  3. Replace any damaged hoses with OEM parts.

3. Clean the Mass Air Flow (MAF) Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Carefully disconnect the electrical connector.
  3. Remove the MAF sensor using a screwdriver.
  4. Spray MAF sensor cleaner on the sensor element and let it dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position (do not start) to check the pressure reading.
  3. Compare the reading to the manufacturer's specifications (usually around 40-50 psi).
  4. If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit
• Sub-steps:
  1. Disconnect the fuel lines from the injectors.
  2. Remove the injectors from the engine.
  3. Use a fuel injector cleaning kit to clean each injector thoroughly.
  4. Reinstall the injectors and reconnect the fuel lines.